95 lines
3.4 KiB
JavaScript
95 lines
3.4 KiB
JavaScript
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import { extname, resolve } from "node:path";
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import { stat } from "node:fs/promises";
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import { BaseDocumentLoader } from "../base.js";
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import { UnknownHandling } from "./directory.js";
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/**
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* A document loader that loads documents from multiple files. It extends the
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* `BaseDocumentLoader` class and implements the `load()` method.
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* @example
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* ```typescript
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*
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* const multiFileLoader = new MultiFileLoader(
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* ["path/to/file1.pdf", "path/to/file2.txt"],
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* {
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* ".pdf": (path: string) => new PDFLoader(path),
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* },
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* );
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*
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* const docs = await multiFileLoader.load();
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* console.log({ docs });
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*
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* ```
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*/
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export class MultiFileLoader extends BaseDocumentLoader {
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constructor(filePaths, loaders, unknown = UnknownHandling.Warn) {
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super();
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Object.defineProperty(this, "filePaths", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: filePaths
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});
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Object.defineProperty(this, "loaders", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: loaders
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});
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Object.defineProperty(this, "unknown", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: unknown
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});
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if (Object.keys(loaders).length === 0) {
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throw new Error("Must provide at least one loader");
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}
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for (const extension in loaders) {
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if (Object.hasOwn(loaders, extension)) {
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if (extension[0] !== ".") {
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throw new Error(`Extension must start with a dot: ${extension}`);
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}
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}
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}
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}
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/**
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* Loads the documents from the provided file paths. It checks if the file
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* is a directory and ignores it. If a file is a file, it checks if there
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* is a corresponding loader function for the file extension in the `loaders`
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* mapping. If there is, it loads the documents. If there is no
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* corresponding loader function and `unknown` is set to `Warn`, it logs a
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* warning message. If `unknown` is set to `Error`, it throws an error.
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* @returns A promise that resolves to an array of loaded documents.
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*/
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async load() {
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const documents = [];
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for (const filePath of this.filePaths) {
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const fullPath = resolve(filePath);
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const fileStat = await stat(fullPath);
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if (fileStat.isDirectory()) {
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console.warn(`Ignoring directory: ${fullPath}`);
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continue;
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}
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const loaderFactory = this.loaders[extname(fullPath)];
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if (loaderFactory) {
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const loader = loaderFactory(fullPath);
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documents.push(...(await loader.load()));
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}
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else {
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switch (this.unknown) {
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case UnknownHandling.Ignore:
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break;
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case UnknownHandling.Warn:
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console.warn(`Unknown file type: ${fullPath}`);
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break;
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case UnknownHandling.Error:
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throw new Error(`Unknown file type: ${fullPath}`);
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default:
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throw new Error(`Unknown unknown handling: ${this.unknown}`);
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}
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}
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}
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return documents;
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}
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}
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